Al-Cu-Mg and Al-Cu-Mg-Zn alloys are made by mechanical alloying process. The influence of the condition of mechanical alloying, compaction and extrusion on the superplastic behavior and microstructure of the material are investigated. Upset and spike forging are conducted by a hydraulic press (low speed) and mechanical press (high speed). The grain size isn't affected by mechanical alloying time when mechanical alloying time becomes long to some extent but there is the most suitable mechanical alloying time for superplastic elongation. The grain size becomes fine according to decrease of extrusion temperature and the fine grain is stable after the heat treatment and tensile test are carried out. The superplastic elongation of mechanically alloyed material becomes large according to the decrease of grain size. The material developed is suitable in the actual use because its tensile strength at room temperature is very high and it shows superplastic elongation in as high speed as mechanical press. The mechanism of high speed superplastic deformation is discussed by using finite element analysis. Forging limit of these materials is very high when high speed mechanical press is used.